package com.itheima.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

//线程安全的问题
public class ServletDemo04 extends HttpServlet {
    //1定义一个用户的成员变量
    private  String username;
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         // String username=null;//方法一
        synchronized(this) {//方法二
            //2获取用户名
            username = req.getParameter("username");

            //3将用户响应给浏览器
            PrintWriter pw = resp.getWriter();
            pw.print("welcome" + username);
            pw.close();
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}
